package com.retoc.oawx.config.xxs;

import cn.hutool.core.util.StrUtil;
import cn.hutool.http.HtmlUtil;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import io.netty.util.internal.StringUtil;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;
import java.nio.charset.Charset;
import java.util.LinkedHashMap;
import java.util.Map;

public class xssHttpServletRequestWrapper extends HttpServletRequestWrapper {

    public xssHttpServletRequestWrapper(HttpServletRequest request) {
        super(request);
    }

    @Override
    public String getParameter(String name) {
        String value =  super.getParameter(name);
        if (!StrUtil.hasEmpty(value)){
            value=HtmlUtil.filter(value);
        }
        return value;
    }

    @Override
    public String[] getParameterValues(String name) {
        String[] values = super.getParameterValues(name);
        if (values!=null){
            for (int i = 0; i < values.length; i++) {
                String v = values[i];
                if (!StrUtil.hasEmpty(v)){
                    v=HtmlUtil.filter(v);
                }
                values[i]=v;
            }
        }
        return values;
    }

    @Override
    public Map<String, String[]> getParameterMap() {
        Map<String, String[]> map= super.getParameterMap();
        LinkedHashMap<String, String[]> result=new LinkedHashMap<>();
        if (map!=null){
            for(String key:map.keySet()){
                String[] values=map.get(key);
                for (int i = 0; i < values.length; i++) {
                    String v = values[i];
                    if (!StrUtil.hasEmpty(v)){
                        v=HtmlUtil.filter(v);
                    }
                    values[i]=v;
                }
                result.put(key, values);
            }
        }
        return result;
    }

    @Override
    public String getHeader(String name) {
        String value = super.getHeader(name);
        if (!StrUtil.hasEmpty(value)){
            value=HtmlUtil.filter(value);
        }
        return value;
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        InputStream in = super.getInputStream();
        InputStreamReader reader=new InputStreamReader(in, Charset.forName("UTF-8"));
        BufferedReader bufferedReader=new BufferedReader(reader);
        StringBuffer body = new StringBuffer();
        String line=bufferedReader.readLine();
        while (line!=null){
            body.append(line);
            line=bufferedReader.readLine();
        }
        bufferedReader.close();
        reader.close();
        in.close();
        Map<String, Object> map = JSONUtil.parseObj(body.toString());
        Map<String, Object> result=new LinkedHashMap<>();
        for (String key:map.keySet()) {
            Object val=map.get(key);
            if (val instanceof String){
                if (!StrUtil.hasEmpty(val.toString())){
                    result.put(key,HtmlUtil.filter(val.toString()));
                }
            }
            else {
                result.put(key, val);
            }
        }
        String json= JSONUtil.toJsonStr(result);
        ByteArrayInputStream bain = new ByteArrayInputStream(json.getBytes());
        return new ServletInputStream() {
            @Override
            public boolean isFinished() {
                return false;
            }

            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setReadListener(ReadListener readListener) {

            }

            @Override
            public int read() throws IOException {
                return bain.read();
            }
        };
    }
}
